[BUG] AST fuzz test regexp find, replace fail

[tgravescs]

Describe the bug
Or nightly 22.10 build failed because of:

06:32:22 - AST fuzz test - regexp_find *** FAILED ***
06:32:22 cuDF failed to compile pattern: (?:\b)? (RegularExpressionTranspilerSuite.scala:771)
06:32:25 - AST fuzz test - regexp_replace *** FAILED ***
06:32:25 cuDF failed to compile pattern: (?:\b)?, original: (?:\b)?, replacement: _\RE\P\L\A\C\E_ (RegularExpressionTranspilerSuite.scala:796)

• AST fuzz test - regexp_find - anchor focused *** FAILED ***
  06:32:27 cuDF failed to compile pattern: (?:\b)? (RegularExpressionTranspilerSuite.scala:771)

[tgravescs]

Anthony pointed out:
might be related to rapidsai/cudf#11373 that was merged yesterday